FASTEST THAN ANY OTHER MOBILE NETWORK OF INDIA. SOMETIMES THERE IS A PROBLEM OF FREE CALLING.SOMETIMES IT IS CONNECTED SOMETIMES NOT. This is app is best for 4g smartphones. when install this app every call is notice you but it’s nessery for install this app . I request to any one use this app and keep enjoying.This time every jio user use jio 4g Voice for best calling and it’s theme is also look best.its new updated app lunched by jio for every jio user .I request every one to use